Motor control device

Abstract

A motor control device includes: a rotation control determination unit configured to determine whether a motor rotation control to rotate the motor fails; a parameter calculation unit configured to calculate a control failure frequency parameter having a correlation with a frequency of failure in the motor rotation control based on a determination result by the rotation control determination unit; and an abnormality determination unit configured to determine whether an abnormality has occurred in the motor based on the control failure frequency parameter.

What is claimed is: 
     
       1. A motor control device configured to control a motor, comprising:
 a microcontroller
 configured to determine whether a motor rotation control to rotate the motor fails; 
 configured to calculate a control failure frequency parameter having a correlation with a frequency of failure in the motor rotation control based on a determination result by the microcontroller; and 
 configured to determine whether an abnormality has occurred in the motor based on the control failure frequency parameter. 
 
 
     
     
       2. The motor control device according to  claim 1 , wherein the microcontroller determines whether a torque, which is applied to a rotating member fixed to the motor to rotate, increases as the abnormality. 
     
     
       3. The motor control device according to  claim 1 , wherein
 the microcontroller determines whether a preset confirmation starting condition, which indicates that the frequency of failures in the motor rotation control is high, is satisfied based on the control failure frequency parameter, 
 the microcontroller is further configured to execute a confirmation motor start for starting the motor so that a start of the motor is likely to fail when the preset confirmation starting condition is satisfied, and 
 the microcontroller determines whether an abnormality has occurred in the motor based on an execution result of the confirmation motor start by the microcontroller. 
 
     
     
       4. The motor control device according to  claim 1 , the microcontroller is further configured to notify that an abnormality has occurred in the motor when the microcontroller determines that an abnormality has occurred in the motor. 
     
     
       5. The motor control device according to  claim 1 , wherein
 the microcontroller is further configured to calculate a control failure probability that is a probability of failure in the motor rotation control; and 
 the microcontroller is further configured to notify the control failure probability. 
 
     
     
       6. A motor control device configured to control a motor, comprising:
 a microcontroller
 configured to execute a confirmation motor start for starting the motor under a confirmation starting condition set in advance so that a start of the motor is likely to fail when an abnormality confirmation command is received from an external device; and 
 configured to determine whether an abnormality has occurred in the motor based on an execution result of the confirmation motor start by the microcontroller. 
 
 
     
     
       7. The motor control device according to  claim 6 , which is mounted on a vehicle so as to control the motor of a fuel pump configured to pump fuel from a fuel tank storing the fuel to supply the fuel to an internal combustion engine mounted on the vehicle via a fuel pipe, wherein
 in case where at least one of a temperature of the fuel tank, a temperature of the fuel pump, a temperature of the fuel, a temperature correlated with the temperature of the fuel tank, a temperature correlated with the temperature of the fuel pump, or a temperature correlated with the temperature of the fuel is equal to or higher than a preset start determination temperature, the external device transmits the abnormality confirmation command to the motor control device immediately after driving of the internal combustion engine is stopped.